'use strict';
const message = process.env['HUSKY_GIT_PARAMS'];
const fs = require('fs');

const types = ['build', 'chore', 'ci', 'docs', 'feat', 'fix', 'perf', 'refactor', 'release', 'revert', 'style', 'test'];

const scopes = ['showcase', 'release', 'packaging', 'changelog', 'schematics', 'module:*'];

function parseMessage(message) {
  const PATTERN = /^(\w+)(?:\(([^)]+)\))?\: (.+)$/;
  const match = PATTERN.exec(message);
  if (!match) {
    return null;
  }
  return {
    type: match[1] || null,
    scope: match[2] || null
  };
}

function getScopesRule() {
  const messages = fs.readFileSync(message, { encoding: 'utf-8' });
  const parsed = parseMessage(messages.split('\n')[0]);
  if (!parsed) {
    return [2, 'always', scopes];
  }
  const { scope, type } = parsed;
  if (scope && !scopes.includes(scope) && type !== 'release' && !/module:.+/.test(scope)) {
    return [2, 'always', scopes];
  } else {
    return [2, 'always', []];
  }
}

module.exports = {
  extends: ['@commitlint/config-angular'],
  rules: {
    'type-enum': [2, 'always', types],
    'scope-enum': getScopesRule
  }
};